“But for all the attention he’s received in the last year-and-a-half, Mckesson’s ties to Teach For America (TFA) have largely escaped scrutiny. Mckesson is an alumnus of the 501(c)3 nonprofit founded by Wendy Kopp in 1990, which education policy experts today regard as the vanguard of the school privatization movement. It is also a media juggernaut in its own right, known for deploying a remarkably sophisticated public relations arsenal to advance an agenda focused on crushing teachers’ unions and privatizing public school systems.

“TFA’s funders—including the Waltons, Bill and Melinda Gates, and top Fortune 500 corporations—all…